GSM7178586: Stage_II_IL33_Induced_Eosinophilia_1; Mus musculus; RNA-Seq
For every mL of TRIzol, 200uL of chloroform was added, and the samples were vigorously mixed and incubated for 2 minutes at room temperature. Samples were centrifuged at 10,000xg for 15 minutes at 4°C to separate the phases. The RNA-containing upper aqueous phase was transferred to a new microcentrifuge tube containing 475uL of isopropanol and 2uL of glycoblue (ThermoFisher, AM9515). Samples were centrifuged at 10,000xg for 15 minutes and supernatant was discarded. One volume of 75% ethanol was added and samples were centrifuged at 10,000xg for 1 minute to precipitate the RNA and discard the supernatant. RNA pellet was resuspended in 40uL of DNase/RNase-free water for a 15-minute DNase treatment (Zymo Research, E1010). DNase treatment was followed by column-based RNA purification with the RNA Clean & concentrator-5 kit (Zymo Research, R1016). Briefly, 100uL of RNA binding buffer was added to every 50L sample and mixed thoroughly. One volume of 100% ethanol was added and the sample was transferred into a Zymo-Spin IC column in a collection tube. Columns were centrifuged at 10,000xg for 30 seconds and flow-through was discarded. The column was washed once with RNA prep buffer and twice with RNA wash buffer, following the manufacturer's instructions. RNA was eluted in 10uL of DNase/RNase-free water. Purified RNA integrity and quantity was assessed using the RNA 6000 Pico kit (Agilent) for the presence of 18s and 28s rRNA peaks. Full length cDNA was prepared from isolated RNA using SMART-Seq v4 Ultra Low Input RNA kit (Takara Bio, 634889) following the manufacturer's instructions, with 17 cycles of cDNA amplification. Final cDNA quality was assessed using Agilent High Sensitivity DNA kit (Agilent, 5067-4626). cDNA libraries were prepared for sequencing using Nextera XT DNA library preparation kit (Illumina, FC-131-1024) using the manufacturer's instructions.